Textured viewport for UDIM material in cycles
In edit mode you can assign different materials to different faces in an object. 


If you have 2 materials:
Face
Body.

duplicate the material set up
set the input texture of the body and the Face correctly.

UV maps work on a value of 0-1 over the U and V axis, if you have a face outside of the grid, it restarts from 0, causing a repeat of the UV coordinates.